METHOD FOR ISOMERISATION OF LIGHT GASOLINE FRACTIONS CONTAINING C-C PARAFFIN HYDROCARBONS Russian patent published in 2011 - IPC C10G65/02 C07C5/22 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for isomerisation of light gasoline fractions containing C₇-C₈ paraffin hydrocarbons by extracting the C₇-C₈ fraction from wide gasoline fractions and bringing said C₇-C₈ fraction into contact with a catalyst containing a hydrogenating-dehydrogenating component on an oxide support in a hydrogen medium at high temperature and pressure in two reactors, fractionation to obtain a product fraction and a fraction of n-paraffins, monomethyl-substituted paraffins and methylcyclohexane which is recirculated into the gas-raw material mixture. The C₇-C₈ fraction (raw material) is extracted such that its content of C₅-C₆ hydrocarbons is equal to 0.1-15 wt %, while that of C₈ hydrocarbons is equal to 0.1-20 wt %, by mixing the extracted C₇-C₈ fraction with hydrogen in molar ratio hydrogen: raw material equal to 0.5-4, with formation of a gas-raw material mixture and feeding said mixture into the first of two series-connected isomerisation reactors at temperature 160-250°C, pressure 1.0-4.0 MPa, and bulk speed for feeding material equal to 1-5 h^-1. Quenched hydrogen at 40-60°C is fed into the second reactor, with molar ratio hydrogen: raw material equal to (0.1-1.0):1, and the oxide support is a composition of metal oxides: aAI₂O₃·bZrO₂·cWO₃·dTiO₂·eMnO₂, where weight ratios of the oxides are as follows: a=0.04-0.30; b=0.60-0.90; c=0.05-0.15; d=0.001-0.10; e=0.001-0.01.

EFFECT: obtaining isomerisate with high octane number.

2 cl, 3 tbl, 17 ex